Subject: [PATCH net-next] net: usb: introduce usbnet_mii_ioctl helper function

From: Ethan Nelson-Moore <[email-masked]>
Date: Sat, 24 Jan 2026 00:01:15 -0800

Many USB network drivers use identical code to pass ioctl
requests on to the MII layer. Reduce code duplication by
refactoring this code into a helper function.

Signed-off-by: Ethan Nelson-Moore <[email-masked]>
---
 drivers/net/usb/asix_devices.c | 11 ++---------
 drivers/net/usb/ax88179_178a.c |  8 +-------
 drivers/net/usb/dm9601.c       |  9 +--------
 drivers/net/usb/mcs7830.c      |  8 +-------
 drivers/net/usb/smsc75xx.c     |  4 +---
 drivers/net/usb/sr9800.c       |  9 +--------
 drivers/net/usb/usbnet.c       |  8 ++++++++
 include/linux/usb/usbnet.h     |  1 +
 8 files changed, 16 insertions(+), 42 deletions(-)

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 232bbd79a4de..9f6d6ddbbc4b 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -104,13 +104,6 @@ static u32 asix_get_link(struct net_device *net)
 	return mii_link_ok(&dev->mii);
 }
 
-static int asix_ioctl (struct net_device *net, struct ifreq *rq, int cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
-}
-
 /* We need to override some ethtool_ops so we require our
    own structure so we don't interfere with other usbnet
    devices that may be connected at the same time. */
@@ -197,7 +190,7 @@ static const struct net_device_ops ax88172_netdev_ops = {
 	.ndo_get_stats64	= dev_get_tstats64,
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_eth_ioctl		= asix_ioctl,
+	.ndo_eth_ioctl		= usbnet_mii_ioctl,
 	.ndo_set_rx_mode	= ax88172_set_multicast,
 };
 
@@ -1276,7 +1269,7 @@ static const struct net_device_ops ax88178_netdev_ops = {
 	.ndo_set_mac_address 	= asix_set_mac_address,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_rx_mode	= asix_set_multicast,
-	.ndo_eth_ioctl		= asix_ioctl,
+	.ndo_eth_ioctl		= usbnet_mii_ioctl,
 	.ndo_change_mtu 	= ax88178_change_mtu,
 };
 
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index b034ef8a73ea..0e9ae89b840e 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -847,12 +847,6 @@ static int ax88179_set_eee(struct net_device *net, struct ethtool_keee *edata)
 	return ret;
 }
 
-static int ax88179_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
-}
-
 static const struct ethtool_ops ax88179_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 	.get_msglevel		= usbnet_get_msglevel,
@@ -998,7 +992,7 @@ static const struct net_device_ops ax88179_netdev_ops = {
 	.ndo_change_mtu		= ax88179_change_mtu,
 	.ndo_set_mac_address	= ax88179_set_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_eth_ioctl		= ax88179_ioctl,
+	.ndo_eth_ioctl		= usbnet_mii_ioctl,
 	.ndo_set_rx_mode	= ax88179_set_multicast,
 	.ndo_set_features	= ax88179_set_features,
 };
diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c
index 2b4716ccf0c5..a31ad425a23d 100644
--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -273,13 +273,6 @@ static u32 dm9601_get_link(struct net_device *net)
 	return mii_link_ok(&dev->mii);
 }
 
-static int dm9601_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
-}
-
 static const struct ethtool_ops dm9601_ethtool_ops = {
 	.get_drvinfo	= dm9601_get_drvinfo,
 	.get_link	= dm9601_get_link,
@@ -351,7 +344,7 @@ static const struct net_device_ops dm9601_netdev_ops = {
 	.ndo_change_mtu		= usbnet_change_mtu,
 	.ndo_get_stats64	= dev_get_tstats64,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_eth_ioctl		= dm9601_ioctl,
+	.ndo_eth_ioctl		= usbnet_mii_ioctl,
 	.ndo_set_rx_mode	= dm9601_set_multicast,
 	.ndo_set_mac_address	= dm9601_set_mac_address,
 };
diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
index fdda0616704e..1aa57645f9ca 100644
--- a/drivers/net/usb/mcs7830.c
+++ b/drivers/net/usb/mcs7830.c
@@ -325,12 +325,6 @@ static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
 	mcs7830_write_phy(dev, location, val);
 }
 
-static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
-}
-
 static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
 {
 	return (struct mcs7830_data *)&dev->data;
@@ -473,7 +467,7 @@ static const struct net_device_ops mcs7830_netdev_ops = {
 	.ndo_change_mtu		= usbnet_change_mtu,
 	.ndo_get_stats64	= dev_get_tstats64,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_eth_ioctl		= mcs7830_ioctl,
+	.ndo_eth_ioctl		= usbnet_mii_ioctl,
 	.ndo_set_rx_mode	= mcs7830_set_multicast,
 	.ndo_set_mac_address	= mcs7830_set_mac_address,
 };
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 78c821349f48..cbc7101e05a6 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -744,12 +744,10 @@ static const struct ethtool_ops smsc75xx_ethtool_ops = {
 
 static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 {
-	struct usbnet *dev = netdev_priv(netdev);
-
 	if (!netif_running(netdev))
 		return -EINVAL;
 
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
+	return usbnet_mii_ioctl(netdev, rq, cmd);
 }
 
 static void smsc75xx_init_mac_address(struct usbnet *dev)
diff --git a/drivers/net/usb/sr9800.c b/drivers/net/usb/sr9800.c
index 57947a5590cc..df267e792aae 100644
--- a/drivers/net/usb/sr9800.c
+++ b/drivers/net/usb/sr9800.c
@@ -485,13 +485,6 @@ static u32 sr_get_link(struct net_device *net)
 	return mii_link_ok(&dev->mii);
 }
 
-static int sr_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
-}
-
 static int sr_set_mac_address(struct net_device *net, void *p)
 {
 	struct usbnet *dev = netdev_priv(net);
@@ -684,7 +677,7 @@ static const struct net_device_ops sr9800_netdev_ops = {
 	.ndo_get_stats64	= dev_get_tstats64,
 	.ndo_set_mac_address	= sr_set_mac_address,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_eth_ioctl		= sr_ioctl,
+	.ndo_eth_ioctl		= usbnet_mii_ioctl,
 	.ndo_set_rx_mode        = sr_set_multicast,
 };
 
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 9280ef544bbb..41b95b04143d 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1085,6 +1085,14 @@ int usbnet_nway_reset(struct net_device *net)
 }
 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
 
+int usbnet_mii_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
+}
+EXPORT_SYMBOL_GPL(usbnet_mii_ioctl);
+
 void usbnet_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 {
 	struct usbnet *dev = netdev_priv(net);
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index 2945923a8a95..b0e84896e6ac 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -290,6 +290,7 @@ extern u32 usbnet_get_msglevel(struct net_device *);
 extern void usbnet_set_msglevel(struct net_device *, u32);
 extern void usbnet_set_rx_mode(struct net_device *net);
 extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
+extern int usbnet_mii_ioctl(struct net_device *net, struct ifreq *rq, int cmd);
 extern int usbnet_nway_reset(struct net_device *net);
 
 extern int usbnet_manage_power(struct usbnet *, int);
-- 
2.43.0